Rails4ã§DBã«ä¿å˜ã—ãªã„Modelã‚’Validationã™ã‚‹ï½œRuby on Rails｜Ruby｜開発ブãƒã‚°ï½œæ ªå¼ä¼šç¤¾Nextat（ãƒã‚¯ã‚¹ã‚¿ãƒƒãƒˆï¼‰æ°¸ç¶šçš„ã«DBã«ä¿å˜ã—ãŸã„データã§ã¯ãªãã¨ã‚‚ã€å…¥åŠ›å€¤ãƒã‚§ãƒƒã‚¯ã‚’è¡Œã„ãŸã„時ã€form_forã§ãƒ•ã‚©ãƒ¼ãƒ を生æˆã—ãŸã„時ãªã©ã€ActiveModelã®ä¸€éƒ¨ã®æ©Ÿèƒ½ã‚’使ã„ãŸã„ã“ã¨ã¯ã‚ˆãã‚ã‚Šã¾ã™ã€‚ Rails3ã§ã¯ActiveAttrã¨ã„ã†Gemを使ã†ã‹ã€ã‚‚ã—ãã¯å‰²ã¨å†—é•·ãªè¨˜è¿°ãŒå¿…è¦ã§ã—ãŸã€‚ class Contact include ActiveModel::Conversion include ActiveModel::Validations extend ActiveModel::Naming extend ActiveModel::Translation attr_accessor :name, :email, :message validates :name, presence: true validates :email, presence: true validates :message,
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